Make the installed web command portable and preserve build failures

[proggeramlug]

The installed bloom-web command fails on Windows because npm's shim tries /bin/bash. The previous script also hides wasm-pack failures behind a tail pipeline and can reuse stale build output.

Expose a portable Node command that preserves compiler exit codes, requires fresh artifacts, and assembles the engine, Perry game and assets after successful compilation. Existing Bash/Python entry points delegate to the shared Node implementation. Add subprocess regression checks to repository contracts and a required Windows pack/install check that invokes npm's actual command.

Validation: all nine regression checks and repository contracts pass. A freshly packed package installs and runs bloom-web --help on Windows. Its installed build command compiles the actual game with Perry 0.5.1220, builds the engine with wasm-pack, and assembles the distribution and assets in a path containing spaces (107.140 seconds; 7,839,672-byte engine WASM). The Node splicer matches the previous implementation on actual Perry output after newline normalization. That initial full build used the synchronous-copy candidate. Following a hosted Node 22 directory-copy failure, the command now awaits asynchronous copies; the same nine local tests and actual pack/install command pass. A fresh package at f30ebd0 also completes the installed full web build (46.109 seconds; 7,839,664-byte engine WASM), including assets and the gated game page.

Stacked on #165. The initial hosted Linux contracts pass; Windows exits during directory-copy regression checks. The original failure is retained, and the asynchronous-copy follow-up passes the hosted Windows pack/install check and Linux contracts. Hosted Tests run 34556841600 passes all 22 jobs; its merge checkout and the PR head have identical Git trees. Browser rendering, native startup and the complete starter/lifecycle remain open; the local browser connection is unavailable. The web guide identifies the portable command as part of the upcoming branch, since stable npm 0.4.16 still has the Bash entry point. Relates to #142, #74, #140 and #145.

Published report and evidence retain the original command and hosted copy failures, exact source, fresh full installed build and all final hosted results. ZIP SHA-256: f0d74f30f4ff5c04b9a3a4c5e64d33c8b8f5765f264a9cd7fed34328ef7a54a2.

[coderabbitai]

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